Eyelet-machine



W. D. PIERSON.-

EYELET MACHINE. APPLICATION FILED :uU/17.1919.

Patented Sept. 21, 1920.

ronny PATENT FME@ wILLIAivi'3o. Hanson, or warnnisuninconimciriou'r, Assreivon rovv THE wanna VBURY rannnnrounnar AND iai-miams contraria, or WATERBURY, coNNEcT'I.- f; CUT, a conronATioN or coNNEcrIcur. f

` armar-MACHINE.

T0 @ZZ whom it may concern:

Be it knownV that I, IVILLIAM D. Pierson,

citizen of the UnitedStates of America, and a resident lof Waterbury, county of New Y Haven, andV State ofConnecticut, have in'- vented certain/new and use-ful improvement's in Eyelet-Machines, the principles of f which are set forth in 'the following de 1 scription and accompanying drawings, wherein is disclosed theform of the invention which I' now consider to be the' best of the variousl forms in which'said princi#` "ples of the invention may be embodied.

This invention relates toimprovements in eyelet machines. 1

The object of this invention is to provide means for preventinginjuries to the bumper and plunger, or either of them, by'the nor-v mal operation ofthe machine.

rIhe invention consists of arrangement and construction shown in Figure 1 of the drawings, Fig. 2 being an outline illustration of theprior art.

Of the drawings Fig. 1 is a side e1evation of the relevant parts of an eyelet machine embodying the improvements;

ig2 is aside elevation showing the most relevant parts of the prior construction;

Fig. 3 is a horizontal section on line 34-3 of Fig. 1 showing the improvements in assembly, and Figs. i to 7 are details ofthe improvements, Figs. and 5 beingy a plan and an elevation-'of the buffoni-od or plate 36 (Fig. l, middle) and Figs. 6 and 7 being an elevation and aplan'of the buffer-support 32 (Fig. 1 middle),

The type of machine to which 'this `inven- 'tion relates is clearly indicated by F 1. The name eyelet machine was first applied to such machines nearly half a century ago because at first they were used only to make eyelets; but subsequent experience demonstrated their vadaptability to yan almost unlimited class of workv of the vnature which'involves theV cutting of a blank Afrom sheet metal and'` subsequent operations of drawing, forming,piercing, light stamping or the like. Hence nowadays eyelet machines are designed and usedto make various small sheet metal articles which are finished complete by the machines without any annealing or subsequent operation whatever. Y

Appiicafipnfiiedriui'y 1751919. serial No. 311,514.Y

the improved' specification of reaersratent. Patentedrsept. 218,?

An eyelet machine is essentially a multi'- ple press; and Fig. 1 is aside elevationof last press turns out the finished product.)

Each` of such presses executes .its special operation on the work, and any suitable cart then essential portion of one of such presses,"` A front elevation would show merely a plu! rality of such presses arranged'side by side rier automatically transfers the articles in process from eachV press to the next.Y

(Such a suitable carrieris shown infU. S. patent i to Kahl, No.` 808,758, dated January 2,

n down or plunger'cam 7 secured by featherv l 3 to cam-shaft2 suitably mounted (mount-.5 -f

ing not shown) in the main framev 1 for al l' the presses. In the position shown in Fig. -1 this plunger cam 7 has )ustcaused a downward plunge of all the parts shown below it save only the stationary frame 1 in which said partsv are mounted to be vertically re-f 'u ciprocable. Near and at the endofthis" downward movement the punch 8G enga-ges the article to be shaped in die 31.

in inaV .1 plungercam 7 is shown in its lowermost stage of operations and pressing against] buffer 36 which is a novel feature.`

Cam-shaft 2 rotates anti-clockwise as indicated by the arrow at the left in Fig. 1. y

Fig. 2 shows all the parts necessary to be considered in order to understandv the prior art, in connection with the prior art fean yet used in the newV combination offltures not F ig. 1. 1 l Mounted on shaft 2 (Figs.` 1 and2)l is a lifting cam 8 (onefor each"y press), whichr .i

(on the continued operation of the machine,- and the continued anti-clockwise revolution Lof this lifting cam 8,) engages beneath the lifting member 9 which is fixed to lifter rod '11, which is reciprocable in the two bronze I bushings 14 (Fig. 1) mounted-in frame 1,1

so that all the movable parts are .lifted to the position shown in Fig. 2 from the lower 'iol 1906). Meanwhile all the mutiple pressesV 'following the action of camshaft 2.

saliY positions shown in Fig. 1. When thus lifted f' the punch 80 (Fig. 1) is separated from the article in process in die 31. All cams Y7 and 8 fare vpreferably of tool steel accurately milled lto. shape and hardenedto resist wear.

VLifter rod 11 (Fig. 1) is fixed by anglel or knee 17 to the plunger 18 at the left soV that all these Yparte reciprocate together As indicated (Fig. 2) by thecoiitour of'plunger Y cam 7 a downward movement of plunger 18 y plunge of 18. A vertical longitudinal adjust`-` is produced, the increment preferably growing less per degree of cam rotation.

ln Fig. 2 the point of cam 7 is about to begin to move down clockwise and in doing so imparts to the member 22A a sides-weeping force.

`Lifter* cam` 8 is shaped as shown, so as not to interfere with the action of pushdown cam 7. Y l 1 For many years the construction Vand operation has been as shown in Fig. 2. The plunger 18 lis usually rectangular in horizontal cross section for convenience in niachiniiig; and at its lower end as shown in Fig.A 1 said plunger carries the punch 30.

Plunger 18.(F ig. 2) is formed with a circular hole26 which receives bumper shank 20 the upper end or head 22A of whichhas existed as` a diametrically square mushroom head extending beyond hole 26 Ventirely around it above apart 29A (F 2) formed on the upper end of plunger 18. As shown Fig. 2 where bumper-head 22A is shown inside elevation, the top of end surface of said. headY has. a curvature (from left to right) from the front of the press toward the rear in the direction of clockwise motion of plunger camV 7, and this curi'f'ature co-acts with said cam to effect the downward nient of plunger and bumper rod is provided (Figs. 1 and 2) so that for any given die 31 vand punch 80 (Fig. 1) in chuck 28 screwed tight in the lower end of plunger 18, such punch will reach its operating position (as shown in Fig. 1) adjacent the die 31, at the instant plunger cam V7 reaches its iowermost position. This adjusting means is shown (Fig. 2) at the lower end of bumper shank 20 near the lower part of hole 28 in plunger 18, and by use of this means the distance may be varied between the top of mushroom Vhead 22A and Vthe lower endof punch Y 30. This adjustment is executed with cam 7-in its lowerniost position 1) and lsuchexecution consists in operating theadjusting means so Vas to force plunger 18 down so as to-cairy' punch 30,(Fig. 1) down to its operating position adjacent dierSl.y Theadjusting means shown comprises (Fig. 2) a key 23 Ventering a hole 25 in plunger 18, the keyentering also an angular dove-tail slot 21'inthe lower end of bumper shank l This memberis termed the bumper vhead and isusually mader of harvde'ned steel.

20, nenthelboaom of Circular haie 26 in bumper 18. Bumper-shank 2() lits tightly in circular hole 26 but not so tightly as to, pre-` vent adjustment'by driving the key 23 in or out. Key 28 is formed'withan angle as shown iso that the drivingoffthe'ke' inward n will force plunger 18;` downwarc.

The latter movement of plunger 18 1 is not "very great but in the prior construction ofV lmachines; it resulted in a clearance space (as shown at Z in Fig..2)v between thebottom of mushroom head 22'A and the end portion Y 29A of plunger 18.

Such `clearance has amounted to several sixteenths of an` inch in some'I cases when lthe fullrange of adjustment hasbecn used asit frequently the case. Ofycourse, however, whenkey 23 is atV the other extreme o positionv of adjust ment the bumper head 22AV will rest directly on 295. but this isnotjthe usualcondition, and usually there isa A.substantial clearance as indicated at Z Fig. 2.. VObviously it is desirable to start adjustingthe tools with the key full out and no clearance yopening at the vtop and lightly taprthe key to drive it in als may be necessary to obtain the cor-4 rect adjustment between the punch and the die.

The effect of the-repeated action of j.

plunger cam 7 on the square mushroom head 22A ofthe above bumpenand-plunger construction of Fig. 2 (involving said clearance space Z) vhas been Vto bend the bumper In another application filed of even date i Y herewith I have provided a remedy for the above defect which consists of fundamental changes in the construction of both the y plunger 18 and thefbuinper'head 22A. That construction is best adapted for use in manufacturing new eyelet machines.V j

In the present invention I have provided a remedy for the abovedefect vwhich is included in the construction ofFig.. 1 and this is particularly adapted to be added to eyelet machinesv already in use and provided with the .old general form of construction of bumper head and plunger head shown in both Figs. 1 and 2, save that in this invention the bumper head is vmade shorter than heretofore which may beV easily Adone on existing machines.

v In the present case..v Vthe only change in the Y constructionA of Abumper and the plunger 18 is such shortening of the vertical length of the bumper head 22A as is shown by 22C in Fig. 1- as I by a pin 33 .or the like.

compared with the vprior. bumper head 22A as shown in Fig. 2, this for a reason to be described.`V v

Following is a description of the {construc-k tio-n of Fig. 1 including Vthe novel features. Atr32 in Fig. 1 (middle right) is a supporting member (shown `in detail ink Figs. 6 and which has a hole 39 (Fig.7) of about the--same diameter asV lifter rod 11, so that f support 32 .can be slipped on rod 11, 'to which itis then secured at the proper point Member32 is a support for the buffer 36 to be described. One' end of supportl 32 has a rounded seat 34 `formed in it (Figs. 7 .and 3) and this seat,Y hasa bell mouthed opening 35 (Figs. 6, 7 and 1) on the side of support 32"v toward bumper head 22 C (Fig. 1).V Rounded seat 34 yreceives rounded end 37 (Figs. `3, 4 and 5)- of a relief arm or buffer rod or plate 36, the rounded end 37b'eing inserted into seat 34 from the open endvof support 32 (Fig.'7) to constitute a hinged'connection. vBuffer rod 36 has a relatively narrow neck 38 (Figs.

4 and which extends through bell mouth 35 (Figs. 6 and 1). Buffer support32 is 4fixed on lifter rod 11 at afpoint (Fig. 1)v

which permits buffer. 36 tofexte'ndforward in a. generally horizontal position towardv the-front of the'machine and rest on top of` bumper head 22 C. Buffer 36 in its'main part which rests .on the `bumper head 22 C has considerable horizontal karea (Figs. y3 and 4.). Fig. 3 shows three of these buffers. 36 with their support 32 on 4the lifter -rod 11, all arranged in series for three consecutive presses of an eyelet machine.

The relief arm orbuffer36 take the side sweep of the pushdown cam.7 so that the bumper head 22 C receives only the vertical component of the force which is-trans.

mitted to it from the cam via the buffer36.

The bumper head 22 Cv is thereby entirely `relieved of the application of forces which would tend to move it transversely and bend bumperv shank 20 or enlarge shanlrhole 26.

' The thickness of the Abuffer plate 36 maybe conveniently approximately one -half l its width so that it is substantial enoughito be so rigid as to transmit the transverse forcesl away from. the'bumperhead 22 Gand t0- ward buffer support 32 which in respect of such forces is resisted by the entire structure including lifter rod 11 and its supports including the main frame 1. The result is to confine and limit substantially all the op A erating power of the pushdown cam 7 toits intended object of moving the bumper and plunger in a right line as shown. The supporting of the buer 36independent of the lbumper head 22 C (by means of member Y 32) leaves the buffer 36 free strains as above stated.

With the construction of buffer support 32 above described including the hinged to take the Vscribed above.

seatffo'r the buffer-36,the latter can'alwaysfv rest directlyfon.thebumper-head 22 @for anyl adjustment ofbumper-and plunger.

Also on account of the interposition of buf;

. fer 36 between the pushdowncam 7 and bumper head 22, theheight ofthe latter is reducedas shown, as compared with the.

'prior bumper head'22a of Fig. 2. That is,

theheight Jofk an old bumper head 22EL (Fig.l

2) is reduced tovthat of 220,. Fig. 1, that is,

toan extent equal to the thickness of buffer 36, so` as to provide space to receive buffer 36 betweenpushdown cam 7 and head 22?. In adapting anold machine to the invention, theheight'of this head'22? (Fig. 2) may be andfplunger' holev 26 from their liability to bev bent andV enlarged respectively" as de-- The constructiondetails of the assembly Y of Fig. lare as follows in addition to' those already described. y

Plunger. 18 isA heldin frame 1 front l of this invention.rk has demon- Y strated that vitrelievesthe bumper shank 2O 85..`

j reduced without great expenseto that of 22C, L

caps .15.' Angle 17 (which 'unites plunger: A

l13 to lifter rod 11) is properly located 'and'. heldfast to lifter rod 11 by ymeans of a pin,

Stability is given to the system consisting of the plunger l18, the bumper shank 2O and lifter rod 11 by means of the .adjustable spring compression friction 12 shown as embracing the upper part ofthe lifter rod,

V11,(,top-1'Fig.` 1). Ths comprises the split bushingr12, the parts` of whichare held. toy geth'er around rod'11 by means ofthe springs shown.; Bushing 12 is mounted in` pla-teil3' secured Vfast to top Offrame 1. as

shown. v Y Y, l

When the'machine comprises more than a 115 --few presses operated by a row vof cams on shaft 2, asaddle14A is secured by bolts 5 to.

the frame'l at a point (not shown) interme` diate theend bearing on shaft 2. The lower side of saddle 4 is conformed to receive a 120 collar 6 mounted in shaft 2 to rotate against a rounded-out lower surface of saddle 4 and thereby maintain correct alinement of cam shaft 2 against the action of the push'- down cams on the buffers 36.

I claim the combination with the and the relatively longitudinally adjustable.

1. In a machine of the character described, 'Y

pu's'hdown cam of the'bumper Ihead without being attached thereto; `the buffer and its support having a loose `joint to permit automatic compensation for adjustment of lplunger and bumper.

2. In a machine of the character described andhaving an operatingv cam and a relatively longitudinally adjustableplung'er and bumper, the bumper having a head locatedV above the plunger and below the cam, the". improvement consisting of a buifer'inter-k posed between the cam and the bumper head,

vto

said bufferbeing ymounted to move with the plunger, whereby the buffer may engage on the top of the bumper head without being connected thereto, the buffer mounting Ybeing loose in the direction of compensation for the adjustment of plunger and bumper.

3; In a machine ofthe character described having an operating cam land a plunger and bumper, the bumper having a shank engaging a hole in the bumper and havinga head lying. beyondA the plunger and larger thanv the bumper shank,.'the improvement consisting of a buffer engaging between the top of the bumper head and the operating cam but supported `independently ofthe bumper' head'although traveling therewith. 4:; vIn a machine of the character described,

Y the construction for a buffer interposed between the operating cam and the bum er head said construction lcomprising a bu er plate, a support thereforV having av vertical hole to receive-its support in turn, the buffer plate having a cylindrical end connected to the plate by a neck, and the buffer support having a corresponding recess to receive said cylindrical end of the buffer and also having 4a bell-mouthed recess communicat--' ing with said cylindrical recess to receive they neck of the buffer plate and permit a limited freedom of movement of the plate; said cy# lindrical members having their axes hori-v zontal whereby the pivotal movement of the buffer plate is along a line between the cam and the bumper head.

thereto.-

5. In a machine ofthe characterY described, the construction of a buffer between the `opprises a buffer plate and a support therefor constructed to travel with said buffer and give the plate a limited freedom of movenient along the linedbetween the vbumper 5 5 erating cani and the bumper head which comhead and the cam but to hold the plate rigidly--froiii movement transverse thereto@ 6.Y Ina machine ofk thel character described, i 'the construction for abuffer interposed between the operating cam. and the bumper head said construction,comprising a buffer',V

plateadapted Vto be interposed between said' cam andfhead, said platehaving an eXtenl sion constructed to be attached to apartvof the machine vother than the bumper head but arrangedto travel therewith to which part Y the bumper is relatively adjustable, whereby v Y the'buifer plate may engage on thetop of the bumper head without being connected thereto; saidl constructionofzthe buffer plate eX-Y tension permitting limited freedomA of. movei menty of the buffer plate. along the line; be-

.tween the cam and bumper head but vholding the buffer plate vrigidly against movement transverse thereto.

7. In a machine of the characterdescribed, the construction `for a buffer between the operating cam and the bumper head, said construction 'comprising a suitablev support,

other than the bumper head, a buffer plate adapted to be interposed'between said cam and bumper head and'having an extension 1 constructed tobe attached to said support, but arranged to travel therewith, whereby the buffer platemay engage on theitop of theV bumper head without being connected thereto. i i

V8. In a machine of the character described, 1.

erating cam and the bumper head, said con struction comprising a suitable support,

'the construction'for a buffer between the op- Y i otherfthan the '.bumperhead, a buffer plate of substantially uniform thickness adapted to beiinterposed between said cam and bumper head and khaving an extension con-v structed to be attached yto'lsaid support, but arranged'to travelV therewith, whereby the buffer plate may engage on thel top of the bumper head without `being 1 connected WILLIAM D. rIERsoN. 1 

